23 



KEY D (Cont. 



5' 



Primary 10 shorter than 8, sometimes shorter than 7; bird largely 

 same color (gray or brown) all over except rump may be white; 

 tertials not notably longer than other secondaries; distinctive musky 

 smell pervades specimen. See PETRELS (Page 27) 



Primary 10 longest primary; usually a stripe running outward along 

 upper surface of wing; belly and back OR back, breast or wings 

 checkered; tertials distinctly longer and more pointed than other 

 secondary feathers; no distinctive musky odor. 6 



6 Upper surface of wing silver-gray, sometimes with buffy edgings 



to coverts; exposed portion of outer few primaries darker than rest 



of wing; tarsi short, <1/10 the wing length. See TERNS (Page 62) 



6' Wing color not as in 6; tarsi proportionately longer, >1/10 the 



wing length. See SHOREBIRDS (Page 42) 



Figure 18. The curvature in the outer edge of the partly 

 folded wing. 



C. 



